| // Copyright 2006, 2007, 2010 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry5.internal.transform; |
| |
| import java.lang.reflect.Modifier; |
| |
| import org.apache.tapestry5.ComponentResources; |
| import org.apache.tapestry5.internal.InternalComponentResources; |
| import org.apache.tapestry5.internal.services.ComponentClassCache; |
| import org.apache.tapestry5.ioc.services.FieldValueConduit; |
| import org.apache.tapestry5.ioc.services.PerThreadValue; |
| import org.apache.tapestry5.ioc.services.PerthreadManager; |
| import org.apache.tapestry5.model.MutableComponentModel; |
| import org.apache.tapestry5.services.ClassTransformation; |
| import org.apache.tapestry5.services.ComponentClassTransformWorker; |
| import org.apache.tapestry5.services.ComponentValueProvider; |
| import org.apache.tapestry5.services.TransformField; |
| |
| /** |
| * Designed to be just about the last worker in the pipeline. Its job is to convert each otherwise unclaimed |
| * field into a value stored in the {@link PerthreadManager}. |
| */ |
| public final class UnclaimedFieldWorker implements ComponentClassTransformWorker |
| { |
| private final PerthreadManager perThreadManager; |
| |
| private final ComponentClassCache classCache; |
| |
| static class UnclaimedFieldConduit implements FieldValueConduit |
| { |
| private final InternalComponentResources resources; |
| |
| private final PerThreadValue<Object> fieldValue; |
| |
| // Set prior to the containingPageDidLoad lifecycle event |
| private Object fieldDefaultValue; |
| |
| private UnclaimedFieldConduit(InternalComponentResources resources, PerThreadValue<Object> fieldValue, |
| Object fieldDefaultValue) |
| { |
| this.resources = resources; |
| |
| this.fieldValue = fieldValue; |
| this.fieldDefaultValue = fieldDefaultValue; |
| } |
| |
| public Object get() |
| { |
| return fieldValue.get(fieldDefaultValue); |
| } |
| |
| public void set(Object newValue) |
| { |
| fieldValue.set(newValue); |
| |
| // This catches the case where the instance initializer method sets a value for the field. |
| // That value is captured and used when no specific value has been stored. |
| |
| if (!resources.isLoaded()) |
| fieldDefaultValue = newValue; |
| } |
| |
| } |
| |
| public UnclaimedFieldWorker(ComponentClassCache classCache, PerthreadManager perThreadManager) |
| { |
| this.classCache = classCache; |
| this.perThreadManager = perThreadManager; |
| } |
| |
| public void transform(ClassTransformation transformation, MutableComponentModel model) |
| { |
| for (TransformField field : transformation.matchUnclaimedFields()) |
| { |
| transformField(field); |
| } |
| } |
| |
| private void transformField(TransformField field) |
| { |
| int modifiers = field.getModifiers(); |
| |
| if (Modifier.isFinal(modifiers) || Modifier.isStatic(modifiers)) |
| return; |
| |
| ComponentValueProvider<FieldValueConduit> provider = createFieldValueConduitProvider(field); |
| |
| field.replaceAccess(provider); |
| } |
| |
| private ComponentValueProvider<FieldValueConduit> createFieldValueConduitProvider(TransformField field) |
| { |
| final String fieldName = field.getName(); |
| final String fieldType = field.getType(); |
| |
| return new ComponentValueProvider<FieldValueConduit>() |
| { |
| public FieldValueConduit get(ComponentResources resources) |
| { |
| Object fieldDefaultValue = classCache.defaultValueForType(fieldType); |
| |
| return new UnclaimedFieldConduit((InternalComponentResources) resources, |
| perThreadManager.createValue(), fieldDefaultValue); |
| } |
| }; |
| } |
| } |